These are the original CASE-GARD ammo boxes. Made of virtually indestructible polypropylene that will not warp, crack, chip, peel, expand or contract, MTM CASE-GARD rifle ammunition cases are still the first choice of rifle enthusiasts throughout the world. MTM's famous living hinge boxes are guaranteed for 1 million open-close cycles or ten years. Snap-Lock latch protects contents from accidental spilling. In the late 1960's, the RS-S-50 was designed specifically for benchrest shooters. The CASE-GARD 50, which is available in eight sizes will hold .22 Hornet to 375 Remington Ultra Mag., with each cartridge resting in its own individual compartment. Each CASE-GARD 50 ammo box is supplied with a load label for recording load and sight data. All rounds listed as bullet up, unless noted. See ammo box charts for more calibers. RSLD-50 for cartridge sizes: 219 Zipper, 223 / 243 / 25 / 270 WSSM, 401 Win. S.L., 458 SOCOM, 460 / 500 S&W Mag., 475 / 500 Linebaugh, 50 Beowulf. Max. OAL= 2.46"